Oracle Solution for Error ora-30457

ORA-30457: 'string

.string

' cannot be refreshed because of unmnanaged NOT NULL columns in container

What triggered the Error:

The container object for the summary contains one or more unmanaged columns do not allow nulls, and which do not specify a default valur for those columns.

What should we do to fix it:

Make sure that default values are specified for all NOT NULL columns that are not part of the summary definition.